package org.codehaus.mojo.animal_sniffer;

/*
 * The MIT License
 *
 * Copyright (c) 2008 Kohsuke Kawaguchi and codehaus.org.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.Set;

import org.codehaus.mojo.animal_sniffer.logging.Logger;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;

/**
 * List up classes seen.
 *
 * @author Kohsuke Kawaguchi
 */
public class ClassListBuilder extends ClassFileVisitor {
    private final Set<String> packages;

    public Set<String> getPackages() {
        return packages;
    }

    public ClassListBuilder(Set<String> packages, Logger logger) {
        super(logger);
        this.packages = packages;
    }

    public ClassListBuilder(Logger logger) {
        this(new HashSet<>(), logger);
    }

    protected void process(String name, InputStream image) throws IOException {
        try {
            ClassReader cr = new ClassReader(image);
            cr.accept(
                    new ClassVisitor(Opcodes.ASM9) {
                        public void visit(
                                int version,
                                int access,
                                String name,
                                String signature,
                                String superName,
                                String[] interfaces) {
                            packages.add(name.replace('/', '.'));
                        }
                    },
                    0);
        } catch (ArrayIndexOutOfBoundsException | IllegalArgumentException e) {
            logger.error("Bad class file " + name);
            // MANIMALSNIFFER-9 it is a pity that ASM does not throw a nicer error on encountering a malformed
            // class file.
            throw new IOException("Bad class file " + name, e);
        }
    }
}
